Hello,
Sorry for the inconvenience, I worked on it to avoid to get the problem again once more.
Except when the pathfinder server bug or is overload, it is better for users than use pathfinder server instead the pathfinder integrated to WRobot, I have generated meshes with better details, you use less RAM (this depend of current continent and used profile, but you can on big continent if you request big profile you can use more than 500mb of ram only for pathfinder (and of course your CPU)), you save time (you don't need to download meshes, this can take a lot of time (several minutes) for big path when you are on new continent), you save disk space ("Kalimdor" continent is ~500mb compressed and 9100 files).
My advantage, yes crack WRobot is more hard (but it is benefit to you also, more there are bots, the more the gold/items loses value and the more the server is able to find protection), but it is the only advantage for me.
I get problems only with Vanilla server, and it is not all time the more used. Last problem with pathfinder was the July 4 (and several times some days before July 4), but before and after pathfinder was stable, I hope than this time it is the last.
Again sorry for the inconvenience.